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Message-ID: <1367851878-21629-2-git-send-email-stefano.stabellini@eu.citrix.com>
Date: Mon, 6 May 2013 15:51:16 +0100
From: Stefano Stabellini <stefano.stabellini@...citrix.com>
To: <xen-devel@...ts.xensource.com>
CC: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <konrad.wilk@...cle.com>,
<marc.zyngier@....com>, <will.deacon@....com>,
<Stefano.Stabellini@...citrix.com>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
<linux@....linux.org.uk>, <nico@...aro.org>, <cov@...eaurora.org>,
<arnd@...db.de>, <olof@...om.net>
Subject: [PATCH RFC v2 2/4] arm: introduce CONFIG_PARAVIRT and pv_time_ops
Introduce CONFIG_PARAVIRT on ARM.
The only paravirt interface supported is pv_time_ops.steal_clock.
No runtime pvops patching yet.
This allows us to make us of steal_account_process_tick for stolen ticks
accounting.
Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
CC: linux@....linux.org.uk
CC: will.deacon@....com
CC: nico@...aro.org
CC: marc.zyngier@....com
CC: cov@...eaurora.org
CC: arnd@...db.de
CC: olof@...om.net
---
arch/arm/Kconfig | 9 +++++++++
arch/arm/include/asm/paravirt.h | 19 +++++++++++++++++++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/paravirt.c | 32 ++++++++++++++++++++++++++++++++
4 files changed, 61 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/include/asm/paravirt.h
create mode 100644 arch/arm/kernel/paravirt.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 344e299..35cb10a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1887,12 +1887,21 @@ config XEN_DOM0
def_bool y
depends on XEN
+config PARAVIRT
+ bool "Enable paravirtualization code"
+ ---help---
+ This changes the kernel so it can modify itself when it is run
+ under a hypervisor, potentially improving performance significantly
+ over full virtualization. However, when run without a hypervisor
+ the kernel is theoretically slower and slightly larger.
+
config XEN
bool "Xen guest support on ARM (EXPERIMENTAL)"
depends on ARM && AEABI && OF
depends on CPU_V7 && !CPU_V6
depends on !GENERIC_ATOMIC64
select ARM_PSCI
+ select PARAVIRT
help
Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
diff --git a/arch/arm/include/asm/paravirt.h b/arch/arm/include/asm/paravirt.h
new file mode 100644
index 0000000..3b95bc6
--- /dev/null
+++ b/arch/arm/include/asm/paravirt.h
@@ -0,0 +1,19 @@
+#ifndef _ASM_ARM_PARAVIRT_H
+#define _ASM_ARM_PARAVIRT_H
+
+struct static_key;
+extern struct static_key paravirt_steal_enabled;
+extern struct static_key paravirt_steal_rq_enabled;
+
+struct pv_time_ops {
+ unsigned long long (*steal_clock)(int cpu);
+};
+extern struct pv_time_ops pv_time_ops;
+
+static inline u64 paravirt_steal_clock(int cpu)
+{
+ return pv_time_ops.steal_clock(cpu);
+}
+
+
+#endif
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index dd9d90a..6764f60 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -86,5 +86,6 @@ ifeq ($(CONFIG_ARM_PSCI),y)
obj-y += psci.o
obj-$(CONFIG_SMP) += psci_smp.o
endif
+obj-$(CONFIG_PARAVIRT) += paravirt.o
extra-y := $(head-y) vmlinux.lds
diff --git a/arch/arm/kernel/paravirt.c b/arch/arm/kernel/paravirt.c
new file mode 100644
index 0000000..3e73fc8
--- /dev/null
+++ b/arch/arm/kernel/paravirt.c
@@ -0,0 +1,32 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2013 Citrix Systems
+ *
+ * Author: Stefano Stabellini <stefano.stabellini@...citrix.com>
+ */
+
+#include <linux/export.h>
+#include <linux/jump_label.h>
+#include <linux/types.h>
+#include <asm/paravirt.h>
+
+struct static_key paravirt_steal_enabled;
+struct static_key paravirt_steal_rq_enabled;
+
+static u64 native_steal_clock(int cpu)
+{
+ return 0;
+}
+
+struct pv_time_ops pv_time_ops = {
+ .steal_clock = native_steal_clock,
+};
+EXPORT_SYMBOL_GPL(pv_time_ops);
--
1.7.2.5
--
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